Mayumi v2.1 chip install (16F84-04/P) - PS1 SCPH-1001

Hey everyone.
Just threw this chip in recently on a SCPH-100x series ps1. it hasn't been done at least recently so i thought i would post a install pic and results on it.



Installation is a bit tricky due to joining pins 4,14 and 5,10 but other than that, its like installing any other chip.

I have tested Spyro 3 and as expected it has gave the "Console may of been modified, Call xxxx" screen. Im going to test some more anti mod games in the future to see how many it will play.

Test Results: Works great but still partial stealth

 

Thats a PU-8 board, when installed on a PU-8 there are 4 modes:

The modes described:

So PU-7 should technically support all anti mod games. PU8 you should try changing modes.

 

"Mode change press Reset to 2sec"
For some reason its not changing modes. If im reading it right, it should be "hold reset for 2 seconds then release". It's odd i tried to get to the disabled mode to make sure its switching modes but its not getting there...

 

for info, you have used the 16f84 or 16f84a?

 

16f84

Do you have the mayumi v3 hex by any chance?

 

I just chiped a PAL SCPH-1002 with the 2.1 - US spyro 3 burn worked fine

 

Also to point out, it was PU8 too

 

Hmm, what install point could of been the cause of the anti-mod screen for me?. Im kinda baffled about this, my soldering is good so i cant seem to know why it hasnt worked for me. Are you sure its not a patched version of spyro 3?

 

Since it sounds like you can't change the mode on the modchip, the first thing I would look at would be pin 9, since that's connected to the reset button. Just stick a meter on the pin and check that it reads about 3V when the switch is released and 0V when it's pressed. You can check the door signal on pin 6 in the same way.

Power, gnd, gate data and clock must be correct since otherwise it wouldn't boot copies at all, so all that leaves you with are pins 12 and 13. Both of these (pad access detect and the XLAT signal from the mechacon) are used for stealth mode, so having them miswired might cause stealth boot problems - but it shouldn't prevent you from changing modes.

 

I tried burns of JPN bishi bashi 2 & ore no ryori first - no problems.
I downloaded spyro 3 from the "paradise for emulation" - I don't think it's a patched version.
For me it starts in borders (50Hz PAL?) then when the US or JPN game has loaded it runs full screen

 

Even though it's not exatly the same problem, I've also got some issues with my own SCPH-1000 (PU-7) chipped with a Mayumi 2.1 ordered from Bad_Ad84. I can still play original games, but the console refuses to launch any backups/originals from other regions. I've tried switching between the 3 modes. When in "disabled" mode, the PlayStation runs backups/other regions discs as it is supposed to (going to Music Player or showing the "error" message). However, in the 2 other modes, the PS goes directly to the menu where you can choose to manage memory cards/launch the Music Player. Originals work fine though.

Do any of you have any idea what I should do?

Here are some pics of my modchip:

 

From those photos, the installation looks fine. One possibility is that you have a very late production SCPH-1000 that has the new BIOS in it, since that will only boot Japanese discs. Try copying one of the Japanese originals you have to a CD-R and see if that boots - if so, then it means that the modchip is working, but the BIOS is rejecting the disc.

 

I just tried and you're right, I can boot Japanese backups. But that's kind of sad because I wanted to be able to play text-heavy games in English

Is there any way to allow that? Like changing the backup's region code like Saturn games? Changing the BIOS chip? Or maybe modifying the modchip's connection so they work in PU-8 mode if that helps?

Update: OK, using the "PS1 Region Boot Patcher" from theisozone I changed a backup's region to Japan and it worked. But I would still like to play original discs from other regions. Do you have any idea how to do it?

 

Yeah, changing the BIOS will work - but you need to find a 40 pin ROM chip that doesn't have the region checks in it. This means either one from a SCPH-1001 or an early SCPH-1000 (the SCPH-1002 BIOS will work, too, but will set the boot mode video to PAL, and that machine doesn't have the PAL reference oscillator, so your color will be screwed up unless you use an RGB cable).

If you have a "game enhancer" type cart (especially one of the ones that's based on Caetla that skips the boot screens) then that's worth trying too, although there are so many code variants that it's impossible to be sure which ones will work.

 

If I need to buy one of those early consoles, I'd rather use that console and leave my newer SCPH-1000 with the new BIOS. Is there any way to flash this early BIOS on a chip like the Saturn or the Dreamcast? And I wouldn't want to use a game enhancer even if I had one because I don't really like the idea of launching the game through this thing. If it's not possible to flash the BIOS on a chip, then I guess I will wait until I find a cheap broken SCPH-100X and play my games using the backup region patch while waiting.

 

OK, I just had a look, and the only SCPH-1000 I have here is one of the old ones that doesn't have the region patch in it - but I also have an SCPH-5000 that has the new BIOS with the region check - and I can confirm that one of those Game enhancer carts (flashed with Caetla 0.35) bypasses the BIOS check when the "Start with PAR/GS Switch Off" is set to "Fastest Start".

I'm pretty sure that the BIOS ROM has a standard JEDEC pinout, so it should be possible to replace it with a flash device, but I've never tried it.

Edit:

On my old SCPH-1000, the rom pinout seems to be compatible with the 29LV400 flash ROM - the flash has 4 more pins, but if you line up pin 3 on the flash with pin 1 on the PCB then it looks correct. You also need to connect up pins 43 and 44 on the chip - if it's pre-programmed, you can just link them to VCC, which is on pin 23.

Note that I haven't actually tried this - I just compared the connections on the board with the device datasheet, but all the address and data lines seem to be going to the right place.

 

OK, I would like to try that, but I don't have any flashing tools so as usual I'll ask Bad_Ad84 if he can do it

But before I do that, if it doesn't work, could it potentially damage a component of the motherboard? I don't don't see any reason for it but I just wanted to ask you since I don't want to break my SCPH-1000.

Also, do you think there is a way to know if a BIOS file with the name scph1000.bin refers to the new or the old one? I'm going to try to check that with an emulator but I imagine that they bypass region locking anyway.

 

I can't see how it would - about the only way could be bus contention, and that would only happen if the CS/ or OE/ pins were wired wrongly and the signals on those pins look exactly the way you would expect. If you are getting one flashed, then it might be worth mentioning that the chip is wired in 8-bit mode on the board (BYTE/ pin grounded, A0 wired to the DQ15 pin) - all the other addresses are shifted up by 1, so A0 on the chip goes to A1 on the board.

The SCPH-1000 BIOS is probably the one without the region check - the one with it seems to normally considered the SCPH-3000 BIOS. The other option is just to use the BIOS image from a SCPH-1001. I just dumped the BIOS from my SCPH-5000, and NO$PSX acts exactly like a real machine with it - it will go the memory card / cd player screen if you try and boot a non-Japanese CD image - but the BIOS from the SCPH-1000 will boot whatever you throw at it, just like the real machine.

CRC32: 3b601fc8
MD5: 239665b1a3dade1b5a52c06338011044

So if it matches that, it's the old one.

Edit: Well, I screwed up those hashes, which perhaps explains why I couldn't find a dump anywhere that matched them. I just dumped it again, and got different numbers - and these match the ones for the file called "ps-10j.bin" in the "psj.zip" archive from the MESS project.

 

OK then if Bad_Ad84 has the tools to flash this chip I will ask him to flash the "ps-10j.bin" and if for whatever reason it doesn't work I'll just put the original BIOS back in place. Thanks a lot for you help TriMesh!

Update: Just to let people know, I have ordered the chip from Bad_Ad84 and I will post the results of this "experiment" around September 10 (2013).

 

TriMesh - dont suppose you happen to know the endianness of the PS1 off the top of your head?

Just want to make sure this is programmed right before shipping.